Imaging lens

Details Imaging lens Imaging lens

1998-11-05

1999-12-07

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359717, 359757, G02B 904, G02B 302

Patent

active

059993383

ABSTRACT:
An imaging lens with a wide image angle, that is compact and bright, is composed of a first lens group of negative refracting power which has three lens elements which are of positive, negative, and positive refracting power, respectively, and a second lens group of positive refracting power. By providing the first lens element on the object side of the first lens group with an aspherical surface, and by fixing the range of the spacing between the first lens element and the second lens element to satisfy a first condition, as well as fixing the spacing between the second lens element and the third lens element to satisfy a second condition, the distortion of the imaging lens is reduced and its resolution is increased.

REFERENCES:
patent: 5699202 (1997-12-01), Yamamoto

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